\begin{table}[htbp]\centering
\scriptsize
\caption{OLS and 2SLS regressions of Log Earnings on Schooling}
\label{2sls_1}
\begin{center}
\begin{threeparttable}
\begin{tabular}{l*{2}{c}}
\toprule
\multicolumn{1}{l}{\textbf{Dependent variable}}&
\multicolumn{2}{c}{\textbf{Log wage}}\\
\multicolumn{1}{c}{}&
\multicolumn{1}{c}{OLS}&
\multicolumn{1}{c}{2SLS}\\
\midrule
educ                &       0.071***&       0.124** \\
                    &     (0.003)   &     (0.050)   \\
exper               &       0.034***&       0.056***\\
                    &     (0.002)   &     (0.020)   \\
black               &      -0.166***&      -0.116** \\
                    &     (0.018)   &     (0.051)   \\
south               &      -0.132***&      -0.113***\\
                    &     (0.015)   &     (0.023)   \\
married             &      -0.036***&      -0.032***\\
                    &     (0.003)   &     (0.005)   \\
smsa                &       0.176***&       0.148***\\
                    &     (0.015)   &     (0.031)   \\
\\
\midrule
\multicolumn{1}{c}{First Stage Instrument}\\
College in the county&               &       0.327***\\
Robust standard error &               &       0.082   \\
F statistic for IV in first stage&               &      15.767   \\
Anderson-Rubin test &               &           .   \\
N                   &       3,003   &       3,003   \\
Mean Dependent Variable&       6.262   &       6.262   \\
Std. Dev. Dependent Variable&       0.444   &       0.444   \\
\bottomrule
\end{tabular}
\begin{tablenotes}
\tiny
\item Standard errors in parenthesis. * p$<$0.10, ** p$<$0.05, *** p$<$0.01
\end{tablenotes}
\end{threeparttable}
\end{center}
\end{table}
